Seiko Cal. 6311 - 660

This Hand-Winding model from 1981 features a 37mm Two-Tone case. It features a Black dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-4c512e34d4fd]

Also known as: Bullhead, Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1981

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